laser -

      Light amplification by stimulated emission of radiation; the device that produces this light.
    latency -
      In video, the time it takes for the light from the phosphor screen to decay after the excitation is removed. Long-persistence phosphor has less flicker of still images, but more blurring of moving images.
    level one videodisc applications -
      Interactive applications based on manual keypad functions, picture stops, and chapter stops.
    level three videodisc applications -
      Interactive applications controlled by an external computer that uses the videodisc player as a peripheral device.
    level two videodisc applications -
      Interactive applications controlled by the keypad and the videodisc player's internal computer. The control program is recorded on the videodisc itself.
    LIB -
      Dynamic-link definition library. A file containing the data needed to build a program .EXE file but which does not contain the dynamic-link programs themselves. Contrast with dynamic-link library.
    light pen -
      A light-sensitive pick device that is used by pointing it at the display surface.
    line graphics -
      Synonym for coordinate graphics.
    line pairing -
      A faulty interlace pattern in which the lines of the second field begin to pair with the lines of the first field rather than fit exactly within them.
    linear audio -
      The analog audio on the linear track of videotape that can be recorded without erasing existing video; used for audio dubbing after video is edited.
    linear video -
      A sequence of motion footage played from start to finish without stops or branching, like a movie.
    link -
      A one-way link (directed edge) from one instance to another. If an instance wishes to send a message, it is sent along all the links from it. An instance can have any number of links coming from it, and any number of other instances can have links to it. An instance cannot select along which links the message should be sent. See also slot. (RTMIDI-specific term)
    LIST chunk -
      A chunk that contains a list or an ordered sequence of subchunks.
    list type -
      (1) A field in the first four bytes of the data field of a LIST chunk. (2) A four-character code identifying the contents of the list.
    locked memory -
      An area of memory that is not available for use because it is being held by another process.
    long shot -
      (1) A camera angle that reveals the subject and the surroundings. Often used as an establishing shot. (2) Synonym for wide shot.
    LS -
      Script abbreviation for long shot.
    luminance signal -
      The portion of image information that provides brightness. Alone, luminance provides a monochrome image.

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